Civil Engineering - Building Materials

36. 

Which one of the following is an air binding material ?

A. Gypsum
B. Acid-resistant cement
C. Quick lime
D. All of these.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

37. 

A good quality stone absorbs water less than

A. 5%
B. 10%
C. 15%
D. 20%
E. 25%.

Answer: Option A

Explanation:

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38. 

Pick up the correct statement from the following:

A. Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite
B. Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite
C. Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic
D. All the above.

Answer: Option D

Explanation:

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39. 

Plywood is made from

A. common timber
B. bamboo fibre
C. teak wood only
D. asbestos sheets.

Answer: Option C

Explanation:

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40. 

Soundness test of cement determines

A. quality of free lime
B. ultimate strength
C. durability
D. initial setting
E. all the above.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.